Bird feeder



FIG. 1 is a top perspective view of a bird feeder showing my new design, the broken lines shown are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a side view of the bird feeder;

FIG. 3 is a top view of the bird feeder; and,

FIG. 4 is a bottom view of the bird feeder. 

The ornamental design for a bird feeder, as shown and described. 